(6) Torque and Static Equilibrium

PAGE EDITORS: Marcelo Norcini, Alexa Kalandiak, and Andrea Wenrich

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Natland Note: (12/10/13)

• Notes look nice and clear
• Posts/images look good, just have small captions saying what the image is showing beneath it.
• let me know if you need help with the sample problems.
• PS you guys rock.

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NOTES:

Brief Notes on Torque (with a sample problem)













NOTE: Torque has the same dimensions as energy, but because torque is not energy, say it is Newton meters (N x m) instead of Joules (J) to avoid confusion


A problem explained step by step from Mr. Natland:







Check Your Understanding 6 (page 253):


Some pictures/diagrams on torque:

Different cases of torque

Balancing with different distances and masses

Note: The torque vector is three-dimensionally perpendicular to the lever arm and the force (which are in the same plane)

This explains where rsin(θ) comes from

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SAMPLE PROBLEMS:




FROM THE TEXTBOOK: Chapter 10 - #s 3, 12, 19, 25, 72





http://www.youtube.com/watch?v=Jrhyb70jt_s



You can comment on the video if you have any questions or have recommendations --Marcelo

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WEBSITES:

Another explanation of torque from NASA:

http://www.grc.nasa.gov/WWW/k-12/airplane/torque.html


What is torque? These website help explain - have a lot of good diagrams

http://physics.tutorvista.com/rotational-dynamics/torque.html
http://www.physics.uoguelph.ca/tutorials/torque/Q.torque.intro.html


A cool explanation of torque using seesaws and ballet dancer (has a video on it but it can't be embedded on this page):

http://www.pbs.org/opb/circus/classroom/circus-physics/center-mass/

The Physics of Dance - neat website about how ballet and physics are related to one another:

http://physicsofdance.homestead.com/ballet2.html

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SOURCES:

http://physics.tutorvista.com/rotational-dynamics/torque.html
http://www.grc.nasa.gov/WWW/k-12/airplane/torque.html
http://hyperphysics.phy-astr.gsu.edu/hbase/torq2.html
http://www.physics.uoguelph.ca/tutorials/torque/Q.torque.intro.html
http://www.pbs.org/opb/circus/classroom/circus-physics/center-mass/
https://www.khanacademy.org/science/physics/torque-angular-momentum/torque-tutorial/v/introduction-to-torque
http://gamedevelopment.tutsplus.com/tutorials/using-torque-and-thrusters-to-move-and-rotate-a-player-designed-spaceship--gamedev-2610
http://physicsofdance.homestead.com/ballet2.html